In Duplum Rule in Kenya: Meaning, Application Beyond Banks & What Borrowers Should Know
A borrower takes a loan of KSh 300,000 to address a financial need. Months later, after falling into default, they receive a demand for KSh 850,000 comprising interest, penalties, and other charges.
Can a debt increase this drastically?
This question is why the In Duplum Rule remains a significant legal safeguard in Kenya. The rule prevents excessive interest accumulation on defaulted loans and promotes fairness in debt recovery. For both borrowers facing inflated demands and lenders seeking compliant recovery, understanding the rule is essential.
What Is the In Duplum Rule? (Legal Definition)
The term in duplum is Latin for "double."
In essence, the rule limits the amount of recoverable unpaid interest on a non-performing loan so that it does not exceed the outstanding principal amount, depending on the facts and applicable law.
The purpose is not to cancel lawful debts but to prevent interest from growing indefinitely, which could turn manageable borrowing into an impossible financial burden.
Legal Basis of the In Duplum Rule in Kenya: Section 44A Banking Act
In Kenya, the rule is codified in Section 44A of the Banking Act (Cap 488) . This provision was introduced to protect borrowers from the unchecked accumulation of interest once loans become non‑performing.
For many years, the rule primarily applied to:
· Banks
· Financial institutions
· Mortgage finance companies
· Other institutions regulated under the Banking Act
This made the principle particularly relevant in bank loan disputes, debt recovery claims, and mortgage default matters.
Does the In Duplum Rule Apply Beyond Banks? (Digital Lenders & Microfinance)
As Kenya’s credit market has evolved, borrowers have increasingly obtained loans from institutions outside traditional banking channels, including:
· Microfinance institutions
· Digital lenders
· Asset finance companies
· Student loan bodies (HELB)
· Other private credit providers
This raises a critical question for borrowers: Does the In Duplum Rule apply to my loan if the lender is not a bank?
Recent court decisions have addressed whether the protections underlying the In Duplum Rule should extend more broadly. However, two conflicting High Court rulings have created legal uncertainty that borrowers and lenders should understand.
Conflicting High Court Decisions: A Breakdown for Legal Clarity
The following two cases represent the current split in Kenyan jurisprudence.
Case 1: The Pro‑Borrower View – HELB Case (August 2022)
Case Name: Mugure & 2 Others v Higher Education Loans Board [2022] KEHC 11951 (KLR)
In this decision, Justice Alfred Mabeya held that the In Duplum Rule is a matter of public interest. He stated: "in this regard, I hold that being of public interest, the in duplum rule will be applicable for those lending monies as it does to banks."
Key Takeaway: This decision effectively applied the rule to all entities that lend money, including non‑bank lenders such as HELB. Borrowers favoring this view argue that the principle behind the rule transcends the specific wording of the Banking Act.
Case 2: The Strict Contractual View – Momentum Credit Case (October 2022)
Case Name: Momentum Credit Limited v Kabuiya [2022] KEHC 13705 (KLR)
Two months later, Justice David Majanja took a different approach. Momentum Credit is a microfinance lender that does not accept deposits from the public. The borrower invoked Section 44A of the Banking Act, arguing that interest had exceeded the duplum limit.
The court held that Section 44A applies only to banks and deposit‑taking financial institutions licensed under the Banking Act. Since Momentum Credit did not take public deposits, it fell completely outside the scope of Section 44A.
Justice Majanja further observed that a court cannot rewrite a contract regarding interest, as parties are bound by the terms of their agreement. The borrower’s only alternative would have been to prove that the interest was unconscionable or the contract otherwise illegal—an argument not pleaded in that case.
Key Takeaway: For non‑bank lenders, the statutory In Duplum Rule does not apply. Borrowers must instead rely on contract law or argue unconscionable terms.
Does the In Duplum Rule Apply to Your Lender?
Does Section 44A Apply?
What Borrowers Should Know
Banks and deposit‑taking institutions
Yes
Statutory protection applies. Interest cannot exceed principal.
Non‑deposit‑taking lenders (private lenders, digital lenders, some microfinance lenders)
Unclear – conflicting case law
Legal position depends on which judge hears the case. Seek legal advice.
HELB (Higher Education Loans Board)
Unclear – conflicting case law
One decision says yes (Mugure); another suggests no.
Because the High Court has delivered contradictory decisions, the law remains unsettled. Borrowers with non‑bank lenders may not automatically benefit from the statutory In Duplum Rule, though they may raise arguments based on public policy or unconscionable conduct.
Why the In Duplum Rule Matters for Borrowers Today
In challenging economic conditions, many individuals and businesses rely on credit. When default occurs, balances can rise rapidly through:
· Default interest
· Penalty charges
· Legal fees
· Collection fees
· Administrative charges
Without a limiting principle, debt can become overwhelming. The In Duplum Rule creates balance between a lender’s right to recover money owed and a borrower’s right to fair treatment, though its current application depends on the nature of the lender.
What Borrowers Should Do: Legal Considerations
If you receive a demand for an amount significantly exceeding the original principal, the following issues may warrant legal review:
· Whether the interest charged is lawful under the applicable statute or contract
· Whether penalty clauses are enforceable
· Whether proper notices were issued before acceleration or default interest
· Whether the claimed balance is mathematically accurate
· What type of lender is involved (bank, deposit‑taker, or private lender) – this changes your legal position significantly
· Whether the lender’s conduct could be challenged as unconscionable
Each case depends on its specific facts, loan documents, and the regulatory status of the lender.
What Lenders Should Consider: Compliance and Recovery
Lenders should ensure that their recovery processes are compliant, transparent, and properly documented. Courts increasingly examine fairness, procedure, and the legality of charges imposed on distressed borrowers.
For non‑bank lenders: Even where Section 44A does not strictly apply, interest rates that appear manifestly unfair may still face judicial scrutiny under other legal principles, including the doctrine of unconscionable bargains.
Proper documentation and transparent interest calculation can help lenders avoid successful legal challenges.
Seeking Legal Advice on Loan Disputes
Given the conflicting case law and the technical nature of Section 44A, both borrowers and lenders benefit from proper legal analysis. A legal review can assess:
· Whether the In Duplum Rule applies to your specific lender
· Whether any part of the claimed interest is irrecoverable
· What arguments are available outside the Banking Act
· Whether a demand is legally enforceable or inflated
For legal guidance on matters arising from this article, you may contact:
Duncan Cheruiyot Advocates
Office Address:
Luxor Towers, Biashara Street
Phone: 0799689 903
Email:
legal@duncancheruiyotadvocates.com
Info@duncancheruiyotadvocates.com
WhatsApp: Consultation requests accepted
Website: https://dunnew.vercel.app/
References
· Section 44A, Banking Act (Cap 488), Laws of Kenya
· Mugure & 2 Others v Higher Education Loans Board [2022] KEHC 11951 (KLR)
· Momentum Credit Limited v Kabuiya [2022] KEHC 13705 (KLR)